Hydraulic pump

ABSTRACT

A hydraulic pump for delivering water from a low level water supply zone to a high level water supply zone includes a power equipment to drive and rotate a slant board which drives a piston moving reciprocally in a housing chamber of a cylinder. The housing chamber has a suction port and a discharge port. The reciprocal movement of the piston in the housing chamber generates a pressure difference to deliver the water from the low level water supply zone to the high level water supply zone.

FIELD OF THE INVENTION

The present invention relates to a pump and particularly to a high efficiency hydraulic pump.

BACKGROUND OF THE INVENTION

A conventional pump, as shown in FIGS. 1 and 2, generally has a power equipment 1 such as a motor to drive and rotate an arched vane 2 to draw water from a lower level water supply zone through a water inlet 3. The water is driven by the arched vane 2 and delivered to a high level water supply zone through a water outlet 4.

However the driving effect resulting from the rotating arched vane 2 is limited. The water pumping height between the low level water supply zone and the high level water supply zone achievable by the rotating arched vanes 2 has a limitation. Moreover, when the arched vane 2 rotates, a great friction occurs between the vane and the water that causes unnecessary energy loss. This also reduces pump efficiency.

SUMMARY OF THE INVENTION

In view of the aforesaid disadvantages, the primary object of present invention is to provide a high efficiency hydraulic pump to reduce energy loss.

The hydraulic pump according to the invention aims to deliver water from a low level water supply zone to a high level water supply zone. It includes a power equipment, a slant board and a water delivery mechanism. The power equipment has a power output shaft which has an axis as the rotation center of the power output shaft. The slant board is coupled on the power output shaft and driven by the power equipment to rotate. The slant board also has a rotation center from which a normal line may be drawn to form an angle difference with the axis of the output shaft. The water delivery mechanism includes a cylinder and a piston. The cylinder has a cylindrical housing chamber which has an opening, and a suction port and a discharge port that include respectively an one way valve to connect and communicate respectively with the low level water supply zone and the high level water supply zone. The piston is housed in the housing chamber. The slant board may be rotated to push the piston and a returning spring so that the piston is moved reciprocally in the housing chamber.

The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a conventional pump.

FIG. 2 is a schematic view of a conventional arched vane.

FIG. 3A is a schematic view of the present invention.

FIG. 3B a schematic view of the present invention in an operating condition according to FIG. 3A.

FIG. 4A is a schematic view of the water delivery mechanism in an operating condition.

FIG. 4B is a schematic view of the water delivery mechanism in another operating condition.

FIG. 5A is a schematic view of a first embodiment of the present invention.

FIG. 5B is a side view according to FIG. 5A.

FIG. 6 is a schematic view of a second embodiment of the present invention.

FIG. 7A is a schematic view of a third embodiment of the present invention.

FIG. 7B is a schematic view of the slant board in an adjustment operation according to FIG. 7A.

FIG. 8 is a schematic view of a fourth embodiment of the present invention.

FIG. 9 is a schematic view of a fifth embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please referring to FIGS. 3A and 3B, the power equipment (not shown in the drawings) according to the invention includes a power output shaft 10 which has an axis 11 serving as the rotation center of the power output shaft 10. The most commonly used power equipment is the motor. However, other equipment that can provide rotational power such as wind mills, water mills and the like may also be used.

A slant board 20 is provided to couple with the power output shaft 10 and be driven by the power equipment to rotate. The slant board 20 also has a rotation center 201 from which a normal line may be drawn to form an angle θ with the axis 11. A water delivery mechanism 30 is provided that includes a cylinder 40, a piston 50 and a returning spring 45. The cylinder 40 has a cylindrical housing chamber 401 which has an opening 402, and a suction port 60 and a discharge port 70 remote from the opening 402 that connect and communicate respectively with a low level water supply zone and a high level water supply zone. The suction port 60 and the discharge port 70 have respectively an one way valve 75 which has a blocking member 752 coupled with an elastic element 751 to close the suction port 60 and the discharge port 70 so that water flows in only through the suction port 60 and flows out through the discharge port 70.

The piston 50 has an outer diameter formed according to the inner diameter of the housing chamber 401. It is placed in the housing chamber 401 through the opening 402. The piston 50 has an O-ring 51 to enhance air tightness. The returning spring 45 is located between the piston 50 and the cylinder 40. The piston 50 has a top end 52 exposed to be in contact with the outer area of the slant board 20 outside the rotation center 201. The top end 52 is semi-spherical so that the slant board 20 can push the piston 50 more smoothly during rotation. Through the rotation of the slant board 20, the piston 50 and the returning spring 45 are pushed and returned so that the piston 50 is moved reciprocally in the housing chamber 401. To reduce friction, the surface of the housing chamber 401 may be coated with a layer of poly-terafluoroethylene (PTFE) or the like that has a low friction coefficient.

Referring to FIGS. 4A and 4B, when the piston 50 is moved reciprocally in the housing chamber 401, the movement can be divided in two stages. The first stage is water suction, and the piston 50 is moved outwards from the cylinder 40 to expand the volume of the housing chamber 401. Due to pressure difference, water in the low level water supply zone is sucked into the housing chamber 401 through the suction port 60. The second stage is water discharge, and the housing chamber 401 is filled with water, and the piston 50 is moved inwards of the cylinder 40 to compress the water and discharge the water through the discharge port 70 to the high level water supply zone. By means of the continuously reciprocal movements of the piston 50 in the cylinder 40, water may be delivered from the low level water supply zone to the high level water supply zone.

Referring to FIGS. 5A and 5B, in order to improve hydraulic efficiency, a plurality of water delivery mechanisms 30 may be clustered on a bracket 80 around and within the covering scope of the slant board 20. The slant board 20 can drive the water delivery mechanisms 30 to increase the hydraulic efficiency. It is to be noted that during rotation of the slant board 20, the rotation center 201 rotates on the same location where is not a desirable location for installing the water delivery mechanisms 30.

Referring to FIG. 6, a plurality of water delivery mechanisms 31 may also be directly and integrally formed in a strut 35. Namely a plurality of housing chambers 401 are formed respectively on desired locations of the strut 35 by machining to house respectively a piston 50.

Referring to FIGS. 7A and 7B, the slant board 20 may also be pivotally coupled on the power output shaft 10. An adjustment bolt 90 is coupled on an anchor board 91 which is fixedly mounted on the power output shaft 10. An adjustment rod 92 is provided that has two ends pivotally coupled on the slant board 20 and the adjustment bolt 90. By adjusting the adjustment bolt 90, the angle θ between the normal line of the slant board 20 and the axis 11 may be altered to change the displacement of the piston 50. Consequently the amount of water being pumped may be changed. Therefore the angle θ may be adjusted according to water requirement. Moreover, in order to avoid deviation of the power output shaft 10, a plurality of adjustment bolts 90 may be provided and evenly and symmetrically spaced on the anchor board 91 relative to the power output shaft 10.

Referring to FIG. 8, the slant board 20 may also have a circular trough 21 formed on the surface that is coaxial with the rotation center 201. The piston 50 is fastened to a guiding member 22 which is wedged in the circular trough 21. When the slant board 20 rotates, the piston 50 is driven to move reciprocally in the housing chamber 401. Referring to FIG. 9, a circular track 23 may also be adhered to the slant board 20 to couple with a guiding member 24 fastened to the piston 50. Similarly, when the slant board 20 rotates, the piston 50 is driven to move reciprocally in the housing chamber 401. If adjusting the angle θ is required for the fourth and fifth embodiments, the mechanism employed in the third embodiment may be adopted. In such an occasion, the guiding members 22 and 24 and the piston 50 have to be bridged by a universal joint (not shown in the drawings) to prevent the rotation of the slant board from being hindered after the angle θ has been adjusted.

In summary, the hydraulic pump according to the invention uses the piston 50 to compress water and move the water from the low level water supply zone to the high level water supply zone. It does not have friction loss occurred to the conventional arched vane. It can pump the water to the high level water supply zone at a higher hydraulic efficiency and a higher water level.

While the preferred embodiments of the invention have been set forth for the purpose of disclosure, modifications of the disclosed embodiments of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention. 

1. A hydraulic pump for delivering water from a low level water supply zone to a high level water supply zone, comprising: a power equipment having a power output shaft which has an axis as the rotation center of the power output shaft; a slant board coupled on the power output shaft to be driven by the power equipment to rotate having a rotation center, the normal line of the slant board forming an angle with the axis of the power output shaft; and a water delivery mechanism having a cylinder, a piston and a returning spring, the cylinder having a cylindrical housing chamber which has an opening and a suction port and a discharge port remote from the opening, the suction port being connected and communicated with the low level water supply zone, the discharge port being connected and communicated with the high level water supply zone, the suction port and the discharge port having respectively an one way valve, the piston having an outer diameter formed according to the inner diameter of the housing chamber and being placed in the housing chamber through the opening, the returning spring being located between the piston and the cylinder, the piston having an exposed top end in contact with the slant board outside the rotation center such that rotation of the slant board drives and pushes the piston and the returning spring to move the piston reciprocally in the housing chamber to allow the water delivery mechanism to deliver the water from the low level water supply zone to the high level water supply zone.
 2. The hydraulic pump of claim 1, wherein the surface of the housing chamber is coated with a material of a low friction coefficient.
 3. The hydraulic pump of claim 2, wherein the material of a low friction coefficient is poly-terafluoroethylene (PTFE).
 4. The hydraulic pump of claim 1, wherein the one way valve includes a blocking member coupling with an elastic element to close the suction port and the discharge port.
 5. The hydraulic pump of claim 1 further having a bracket for holding multiple sets of the water delivery mechanism.
 6. The hydraulic pump of claim 1, wherein multiple sets of the water delivery mechanism are formed in a strut.
 7. The hydraulic pump of claim 1, wherein the slant board is pivotally coupled on the power output shaft which has an anchor board fixedly mounted thereon, the anchor board having an adjustment bolt screwed thereon, the slant board and the adjustment bolt being pivotally coupled to two ends of an adjustment rod such that the angle between the normal line and the axis is changeable by adjusting the adjustment bolt.
 8. The hydraulic pump of claim 7, wherein multiple sets of the adjustment bolt are evenly and symmetrically located on the anchor board about the power output shaft.
 9. The hydraulic pump of claim 1, wherein the piston has an O-ring.
 10. The hydraulic pump of claim 1, wherein the exposed top end of the piston is semi-spherical.
 11. A hydraulic pump for delivering water from a low level water supply zone to a high level water supply zone, comprising: a power equipment having a power output shaft which has an axis as the rotation center of the power output shaft; a slant board coupled on the power output shaft to be driven by the power equipment to rotate having a rotation center, the normal line of the slant board forming an angle with the axis of the power output shaft, the slant board having a circular track adhered to the surface thereof that is coaxial with the rotation center, the circular track being coupled with a guiding member; and a water delivery mechanism having a cylinder and a piston, the cylinder having a cylindrical housing chamber which has an opening and a suction port and a discharge port remote from the opening, the suction port being connected and communicated with the low level water supply zone, the discharge port being connected and communicated with the high level water supply zone, the suction port and the discharge port having respectively an one way valve, the piston having an outer diameter formed according to the inner diameter of the housing chamber and being placed in the housing chamber through the opening, the piston being connected to the guiding member such that rotation of the slant board drives and pushes the piston moving reciprocally in the housing chamber to allow the water delivery mechanism to deliver the water from the low level water supply zone to the high level water supply zone.
 12. The hydraulic pump of claim 11, wherein the circular track is replaced by a circular trough which is formed on the slant board, the guiding member being wedged in the circular trough and connected to the piston.
 13. The hydraulic pump of claim 11, wherein the surface of the housing chamber is coated with a material of a low friction coefficient.
 14. The hydraulic pump of claim 13, wherein the material of a low friction coefficient is poly-terafluoroethylene (PTFE).
 15. The hydraulic pump of claim 11, wherein the one way valve includes a blocking member coupling with an elastic element to close the suction port and the discharge port.
 16. The hydraulic pump of claim 11 further having a bracket for holding multiple sets of the water delivery mechanism.
 17. The hydraulic pump of claim 11, wherein multiple sets of the water delivery mechanism are formed in a strut.
 18. The hydraulic pump of claim 11, wherein the guiding member and the piston are bridged by a universal joint, the slant board being pivotally coupled on the power output shaft which has an anchor board fixedly mounted thereon, the anchor board having an adjustment bolt screwed thereon, the slant board and the adjustment bolt being pivotally coupled to two ends of an adjustment rod such that the angle between the normal line and the axis is changeable by adjusting the adjustment bolt.
 19. The hydraulic pump of claim 18, wherein multiple sets of the adjustment bolt are evenly and symmetrically located on the anchor board about the power output shaft.
 20. The hydraulic pump of claim 11, wherein the piston has an O-ring. 